Abstract : With the aim of building a -Semantic Web- , the content of the documents must be explicitly represented through metadata in order to enable contents-guided search. Our approach is to exploit a standard language RDF, recommended by W3C for expressing such metadata and to interpret these metadata in conceptual graphs CG in order to exploit querying and inferencing capabilities enabled by CG formalism. The paper presents our mapping of RDF into CG and its interest in the context of the semantic Web.